Vertically adjustable scaffold carriage



Oct. 2, 1951 R. BoEDEcKl-:R 2,559,553

VERTICALLY ADJUSTABLE SCAFFOLD CARRIAGE Filed May 26, 1947 3 Sheets-Sheet l ATTORNEY Oct. 2, 1951 R. BOEDECKER VERTICALLY ADJUSTABLE scAFFoLD CARRIAGE 3 Sheets-Sheet 5 Filed May 26, 1947 -25 za`d 24 lNvENoR ATTRNEY Patented Oct. 2, 1:2951

JUSTABLE SCAFFOLD ARRIAGE.

Robert Bo'edecker, Tacoma, Wash.; Peggy Boedecker', Yadministratrix of...`saicl Robertv Boedecker, deceased; assi Tacoma Weshgnor to Fred R. Boedecker,

'-lhis invention relates to the buildingindustry andhas vspecial.referencei to the scaffolding. used f toename their/@ramen 'to reach al1' parts.' ofthe walls'of the structurebeing built; it has further special reference to: the'v platforms supported by thescaifold.

The objects of my invention are,` rst, to improvethe'soa'iiold whereby'rthe working platforms may be raised' orV lowered! asv may be required; second; to` 'provide' abox track. on the 'scaiold to hold the platform in horiontal position as it is raised orwloweredv,V third, to provide a movable vertical base for the platform brackets; fourth, to providebraekets.detachably supported bysaid base;` fifth.,4 to savetime and labor in adjustiiig 'thplatfrms to' the ht needed by me workmen; and sixth, to Aprovide an eminently practical and'A highly eiicient`"me'chanism for the accomplishment of the aboveobjects.

L attain these. and otherobiectsas will. readily beunderstood .by th. Afamllar.with the art, by the devices. mechanisms.. and. .arrangements i1- lustrated f in' the.. ac.c omnanyrlgv drawings.. in which: Figi isan. end riet/.nf .e .Saalfeld equipped with my invention.; Fie... 2 .is anerspectvevew of a portion the ,ofm amartbeingbroken away to reveal the constructionitl'fereofj Fig. 3 is a side elevation" of a portion thereof- Fig. 4 is da 'iront elevation ofthe carrier or base;Fig. 5.?is`a' side view of one of the pulleys at the top of the scaffold; Fig. 6 is a plan view of a node in the platform support, showing a part of the scaold in section; Fig. 7 is a side View showing the connection between the supporting cable and the carrier or base; and Fig. 8 is a View of the hook connecting the carrier or base with the guide carriage.

Similar numerals of reference refer to the same parts in the several views.

My invention is illustrated as applied to a steel sectional scaiold lo in which the several units are composed of successive sections which are rmly secured together, one above the other, such as is commonly in use in the building industry, but it is to be understood that it may be applied to any suitable for-m of scaffold. To each of the outer legs II of such a sectional scaiold unit, I mount a hand winch I2, having suitable ratchet means to hold the drum thereof in selected position, to prevent it from accidentally unwinding the cable I3. This cable I3 extends upward from the winch I2 to the upper part I4 of the scaffold. A pulley I is mounted in a suitable frame I6 (Fig. 5) which is secured to the scaiold at the upper end of the outer leg II thereof.

2-1 The cable I3 turns over the pulley I54 and passes thence over a similar pulley I'IV secured over the inner leg I8 of the vsca'iold Il), and

thence downward to thecarrier or base I9 (Fig. 4)-where it is secured to the upper member 20 thereof by a shackle 2| (Fig. '7)

Thisfcarrier I9 comprises a structure composed of the said upper horizontal lmember 20,- a parallel lower member 2K2, a plurality of vertical inembers 23-joining the said horizontal members 20 and' 22- and somediagonal brace members 25, all said parts' being suitably Welded together to" form a single structure. This carrier I9- hangs in a vertical plane along the vertical inner side of the scafioldgextending horizontally past severalof the units composing'the sc aiold,v and forms the base or frame for the platform brackets to be attached to.

'Eachofthe inner legs I8 of -the scaiiold h as a boxtrack 25 (Figs. 2, 3, 6) suitably Isecured to it and extending vertically thevlength of said leg; the box tracks of one leg coordinating withl those' above' and below it to form a continuous box trackfrom' the top to the bottom of vthe scaffold Ill.A "These tracks 25 are of boX form with la conti'nuous slot'26 along the: centerV ofVV its exposed Side..

` Awheeled carriage 21 (Figs. 2, 3, and 6) rides vertically inside thebox'trackfridingo yeach side of the slot 26, and is provided with a hook'28 (Fig. 8) extending out from the slot and adapted to engage over the upper member 20 of the carrier I9. A bolt 23 passes through the outer leg of the hook 28 to pass under the member 2E) to hold the hook 28 in engagement with the said member 2U.

A plurality of brackets 30 (Figs. 1, 2, 3) are removably mounted in any desired position on the carrier I9. Each bracket 30 is formed of a vertical tubular member 3l, having a hook 32 extending from its upper end and adapted to pass over the upper member 20 of the carrier I 9. The lower end of the vertical member 3| of the bracket is provided with a socket 33 adapted to lie on the side of and partially enclose the lower member 22 of the carrier I9. A horizontal arm 33 extends from a point near the upper end of the vertical member 3l, and is provided with a safety lug 35 at its end, adapted to prevent the outer plank 36 of the platform from sliding oi the bracket 30. A diagonal brace 3'! joins the lower end of the member 3| with the outer end of the arm 3ft. The parts 3l, 3d and 31 are rmly welded together to form a single bracket 3D, and the parts 32 and 33 are welded thereto. Planks 36 are laid on the arm 34 to provide a floor on which the workmen may stand. Other planks 38 may be laid on the cross members 39 of the scaffold, adapted to receive the material to be used.

Thus it will be seen that I have invented a means for raising or lowering the working platforms of the scaffold, which is quick and easy to operate and which will hold the platform at any desired level. It is, of course, obvious that the weight of the platform with itsload tends to tip the top of the brackets outward, thus tending to pull the top member 20 of the carrier I9 out from the scaffold, and that this tendency is negatived by the pull of the carriage 21 against the outer member of the box track 25, through the hook 28 connecting the member 20 to the carriage 21. Similarly the lower ends of the brackets 3U press inward on the lower member 22 of the carrier I9, said lower member riding freely on the outside of the box track 25. Thus the arms 34 of the brackets are always kept horizontal, independent of their position in relation to the legs I8 of the scaffold. Also, it will be understood that, due to the width of the hooks 32 and the sockets 33, the said brackets will always extend out at right angles from the scaffold and will resist any horizontal swinging motion on the carrier, the planks 36 also resisting such motion.

It is, of course, understood that many changes may be made in the details of my invention, without departing from the spirit thereof as outlined in the appended claims.

Having described my invention, what I claim and desire to secure by Letters Patent is:

1. In a scaffold platform, the combination with a scaffold composed of units set side by side, each unit having inner and outer legs braced together; a box track attached to the inner leg of each of said units and extending the full vertical length of said unit; a slot in each said box track and extending the full length thereof; a carriage inside each said box track and having a hook extending therefrom through said slot; a carrier composed of a vertically hung structure having upper and lower members extending past a plurality of said units and having its upper member engaged by the several hooks extending from said carriages in said box tracks; a plurality of brackets, each hooked to and movable along the upper member of said carrier and supported thereby, and having a lower member engaging the lower member of said carrier, and having a horizontal arm adapted to receive the planks extending from one to another bracket to form a platform; and means adapted to adjustably support said carrier.

2. In a scaffold platform for a sectional scaffold comprising a plurality of units, each unit composed of a plurality of sections one above the other each such section being composed of inner and outer vertical legs braced together; the combination of a box track secured to the inner leg of each section of each unit, the box track of one section registering with the box track of the adjacent sections, each box track having a registering slot in its outer side; a carriage within the box track of each unit; a carrier comprising a structure having a top member extending past a plurality of said units and having a plurality of platform brackets extending laterally therefrom and movable thereon; means to support the carrier and comprising a cable attached to said top member and extending upward therefrom and secured to said scaffold; and a hook secured to each carriage and engaging the top member of said carrier to hold it from pulling away from said box track under the action of the loads on said platform brackets.

ROBERT BOEDECKER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 388,924 Smith Sept. 4, 1888 470,032 Anderson Mar. 1, 1892 474,406 Ramsey May 10, 1892 698,423 Wellman Apr. 22, 1902 2,295,995 Lamb Sept. 15, 1942 2,383,449 Clark Aug. 28, 1945 FOREIGN PATENTS Number Country Date 22,651 Great Britain 1903 

